We have this one: http://www.homeplug.org/kshowcase/view/view_item/cbe698b73089fcaab1667270ed2d7b6df8ab310f Works fine.
I couldn't get my PLK300's to work with anything, and LInksys website is a mess with flash files appearing and disappearing all the time. I've had good results with Zyxel, but why not just use a single homeplug and a straightforward Fast Ethernet switch? Available plugs maybe?
Just seems more sensible to get a single dedicated unit if there is one (no additional unit sitting there plugged in wasting space/power). And assuming you get over 100mbps, then any ethernet switch might unecessarily congest it?